I stand corrected on the Martin strings, and if you want an identical replacement you'll have to get it through Martin. 450+ is close though.
Dynaflight '97 works for me--get lots of comments on how quiet my bow is. Again though, bows can vary, as do the people who shoot them. Some bows seem to "like" one material over another. I've even noticed a lot of difference with one material (on my bow) with a different strand count in the string.
Tuning goes a long, long way in a quiet shot--brace height, silencer placement, and nock fit are all important.
Chad